This AT200-18HD clutch alignment tool is designed for accurate clutch installation on Endurant transmissions using a 2″ 18-spline input shaft. Proper alignment is critical to ensure smooth transmission installation and to prevent damage to the clutch disc, pilot bearing, or input shaft. The tool features a 1.150″ pilot shaft designed to fit into a 1.250″ pilot bearing, allowing precise centering during clutch installation. Built for heavy-duty applications, this line-up shaft is suitable for professional mechanics and serious DIY users working on modern heavy-duty drivetrains. This is a non-OEM replacement tool, manufactured for fit and function compatibility. Brand names and part numbers are used strictly for identification and compatibility reference.